You can tell the type of join (INNER, RIGHT, or LEFT) by the details of the join operator.

可以根据连接操作符的细节判断连接的类型(INNER、RIGHT或LEFT)。

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Generate the expression for the join predicate by applying the join operator to the expressions for the left and right attributes.

将联结操作符应用于左右属性的表达式，从而产生联结谓词的表达式。

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As with the UNION operator, the join operator itself remains synchronous and is only able to process input from one leg of the join at a time.

和UNION操作符一样，连接操作符本身是同步的，每次只能处理来自连接操作符某一个分支的输入。

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